To print a photograph with a lamp giving light intensit

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To print a photograph with a lamp giving light intensity I1 = kd and 60 at a distance r1 = 1 m, the exposure required t = 2 s. What need exposure for printing the same image with the lamp I2 = 40 cd at a distance r2 = 2 m from the picture?

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Task 40930. Detailed solution with a short recording conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.
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